Objective: We investigated hypertension and diabetes mellitus in two management settings, namely cardiology and endocrinology, and their associations with albuminuria while accounting for the management of these two diseases. Methods: Our multicentre registry included patients (>= 20 years) seen for hypertension in cardiology or for diabetes mellitus in endocrinology. We administered a questionnaire and measured blood pressure, glycosylated haemoglobin A1c and albuminuria. Results: Presence of both hypertension and diabetes was observed in 32.9% of hypertensive patients in cardiology (n = 1291) and 58.9% of diabetic patients in endocrinology (n = 1168). When both diseases were present, the use of combination antihypertensive therapy [odds ratio (OR) 0.31, P<0.0001] and inhibitors of the renin-angiotensin system (OR 0.66, P = 0.0009) was less frequent in endocrinology than cardiology, and the use of combination antidiabetic therapy (OR 0.16, P<0.0001) was less frequent in cardiology than endocrinology. The control of hypertension and diabetes, however, was not different between the two management settings (P >= 0.21), regardless of the therapeutic target (SBP/DBP<140/90 or 130/80 mmHg and glycosylated haemoglobin A1c <7.0 or 6.5%). The prevalence of albuminuria was higher (P <= 0.02) in the presence of both diseases (23.3%) than those with either hypertension (12.6%) or diabetes alone (15.9%). Conclusion: Hypertension and diabetes mellitus were often jointly present, especially in the setting of endocrinology. The management was insufficient on the use of combination antihypertensive therapy and inhibitors of the renin-angiotensin system in endocrinology and for combination antidiabetic therapy in cardiology, indicating a need for more intensive management and better control of both clinical conditions.